Mashable provides an overview of the many changes to TweetDeck that they just rolled out of an extended beta period. From the article (includes video):

” Twitter has also taken this opportunity to refocus users on its own services. So Twitter’s TweetDeck defaults to Twitter’s URL shortener and Twitter’s photo services. Old TweetDeck delivered photos to YFrog by default and still used bit.ly for URLs. You can still choose to use these services, but with them now hidden behind a settings menu choice it’s unlikely TweetDeck users will ever use them again. “